Ham Radio Workbench Podcast
  • HOME
  • Podcast
  • Projects
    • DC Power Strip >
      • DC Power Strip Assembly
    • BenchDuino >
      • BenchDuino Builder's Notes
    • K6BEZ Antenna Analyzer
    • 4-Port Coax Relay
    • QRP Smarty Load
    • QRP Dummy Load
  • Articles
  • Blogs
  • Shop
  • Resources
  • INDEX
  • About
  • Contact
  • HOME
  • Podcast
  • Projects
    • DC Power Strip >
      • DC Power Strip Assembly
    • BenchDuino >
      • BenchDuino Builder's Notes
    • K6BEZ Antenna Analyzer
    • 4-Port Coax Relay
    • QRP Smarty Load
    • QRP Dummy Load
  • Articles
  • Blogs
  • Shop
  • Resources
  • INDEX
  • About
  • Contact

Ham Radio Workbench Podcast Episodes

All About Ferrites

7/26/2021

3 Comments

 
Picture
In this show George, Mark, Rod and Mike talk about what's on their workbenches and take a deep dive into the topic of ferrites.  We explore what they are, how they work and practical applications.

SHOW NOTES

QSO Today Expo https://www.qsotodayhamexpo.com/

Jetstream JTBM270 3-ELEMENT 2M 5-ELEM 70CM DUAL BAND VHF UHF YAGI BEAM ANTENNA
https://www.ebay.com/itm/401688089979?epid=1124956691&hash=item5d8679d57b:g:gJ0AAOSwHPlWfa1F

Rig Expert AA-650 Antenna Analyzer
https://www.dxengineering.com/parts/reu-aa-650zoom

Stream Deck - Large version
https://www.amazon.com/Elgato-Stream-Deck-XL-customizable/dp/B07RL8H55Z/ref=sr_1_3?dchild=1&keywords=stream+deck&qid=1627088153&sr=8-3

Toroids.info

Resources
The ARRL Handbook, specifically 
Volume 2 chapter 5, section 5.5 of the 2020 handbook
“Ferrite Materials” (5 pages of rich goodness)
And
Volume 5 Chapter 22 - (ferrite component sizes, values in tables)

Where should I buy them ?
Digikey
Palomar Engineers
Amidon Associates


3 Comments
jim Sutton link
7/28/2021 10:25:07

Mike and Georges comment's about VHF/UHF radios sent me on a search for a D710 or FTM-7250 which resulted in a show idea. Buying and selling online - where to look, what to look for or look out for. How to write a great ad if you are trying to sell something.
Keep up the great work - 73

Reply
John VE3IPS
8/17/2021 09:49:53

How to identify junkbox cores ferrite materials :-)

G8JNJ: Baluns and Tuners:
http://www.g8jnj.net/Balun%20construction.pdf
http://web.archive.org/web/20170806130801/http://www.g8jnj.net/Balun%20construction.pdf
Citat: "...
The easiest way to identify most ferrite materials is to wind about four turns of wire through the core and then measure the lowest frequency at which the value of reactive impedance equal resistive impedance i.e. X=R. There will be some variation between different batches and sizes of materials. But if you can plot the results graphically you can easily identify the 'signature' of each material.
Here are my references for some common ferrite materials
FT240-77 0.74MHz
FT240-31 3.5MHz
FT100-33 7MHz
FT240-43 17MHz
FT240-K 22MHz
FT240-52 31MHz
FT240-61 58MHz
Iron powder has a slightly different 'signature' it usually has a very low resistive component, which peaks to a higher value near self resonance. The more lossy the material the broader and lower value of resistive peak is apparent.
T200-52 40MHz Lime Green (& Blue or Red) colour common in PC switch mode power supplies - moderate loss
T200-26 60MHz Yellow & White colour common in PC switch mode power supplies - high loss
T200-2 60MHz Dark Red colour used for HF tuned circuits (& Ruthoff Ununs) - high Q low loss
T200-1 70MHz Blue colour not common - moderate loss
T200-6 100MHz Yellow colour used for VHF tuned circuits - high Q low loss

Reply
Sonny
9/29/2021 18:04:59

Im 1/2 way through it and nothing about Ferrites yet. Come on!

Reply



Leave a Reply.

    Subscribe

    iTunes
    Google Play Music
    Stitcher
    Android
    ​
    Direct RSS

    Archives

    November 2022
    October 2022
    September 2022
    August 2022
    July 2022
    June 2022
    May 2022
    April 2022
    March 2022
    February 2022
    January 2022
    December 2021
    November 2021
    October 2021
    September 2021
    August 2021
    July 2021
    June 2021
    May 2021
    April 2021
    March 2021
    February 2021
    January 2021
    December 2020
    November 2020
    October 2020
    September 2020
    August 2020
    July 2020
    June 2020
    May 2020
    April 2020
    March 2020
    February 2020
    January 2020
    December 2019
    November 2019
    October 2019
    September 2019
    August 2019
    July 2019
    June 2019
    May 2019
    April 2019
    March 2019
    February 2019
    January 2019
    December 2018
    November 2018
    October 2018
    September 2018
    August 2018
    July 2018
    June 2018
    May 2018
    April 2018
    March 2018
    February 2018
    January 2018
    December 2017
    November 2017
    October 2017
    September 2017
    August 2017
    July 2017
    June 2017
    May 2017
    April 2017
    March 2017
    February 2017
    January 2017
    December 2016
    November 2016
    October 2016
    September 2016
    August 2016
    July 2016

    Categories

    All
    3D Printing
    Amateur Satellite
    APRS
    Audio
    BayCon
    Benchduino
    Digital Data
    Digital Voice
    DIY Projects
    DIY Radios
    DMR
    Electronics
    EME
    Emergency Communications
    Field Day
    Field Radio
    Ham Shack
    Hamvention
    HF Antennas
    HF Operation
    History
    Licensing
    Magnetic Loop
    Maker Faire
    Making
    Microcontrollers
    Microwave
    Networking
    New Ham
    PCB Design
    Portable
    Power
    QRP
    Questions And Answers
    Radio Principles
    Remote Operation
    Repeaters
    Restoration
    Shopping Show
    Single Board Computers
    Software Defined Radio
    Solar
    SOTA
    Station Controller
    Test Equipment
    Thermatronic
    Tools
    Trailer
    Tube
    Vintage
    VOIP
    Workbench
    Youth

    RSS Feed

Brandmeister Talkgroup 31075
©2016-2020 Ham Radio Workbench, All Rights Reserved
Connect on Brandmeister Talkgroup 31075